Community responses of testate amoebae (Arcellinida and Euglyphida) to ecological disturbance explained by contrasting assembly mechanisms in two subtropical reservoirs

被引：0

作者：

Ndayishimiye, Jean Claude ^{[1
,2
]}

Nyirabuhoro, Pascaline ^{[1
,2
]}

Gao, Xiaofei ^{[2
,3
]}

Chen, Huihuang ^{[2
,4
]}

Wang, Wenping ^{[2
,5
]}

Mazei, Yuri ^{[1
,6
,7
]}

Yang, Jun ^{[2
]}

机构：

[1] Shenzhen MSU BIT Univ, Fac Biol, Shenzhen 518172, Peoples R China

[2] Chinese Acad Sci, Inst Urban Environm, Fujian Key Lab Watershed Ecol, Key Lab Urban Environm & Hlth,Aquat EcoHlth Grp, Xiamen 361021, Peoples R China

[3] Henan Normal Univ, Coll Fisheries, Xinxiang 453007, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] Huaibei Normal Univ, Huaibei 235000, Peoples R China

[6] Lomonosov Moscow State Univ, Leninskie Gory 1, Moscow 119991, Russia

[7] Russian Acad Sci, AN Severtsov Inst Ecol & Evolut, Leninsky Prospekt 33, Moscow 117071, Russia

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2024年 / 953卷

基金：

中国国家自然科学基金; 俄罗斯科学基金会;

关键词：

Typhoon; Drought; Deep reservoir; Testate amoeba community; Stochastic processes; Deterministic processes; CYANOBACTERIA DOMINANCE; MICROBIAL LOOP; PHYTOPLANKTON; WATER; EXTREMES; SURFACE; IMPACT; SOIL;

D O I：

10.1016/j.scitotenv.2024.176058

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Mechanisms underlying the effects of ecological disturbance on aquatic ecosystems remain uncertain in subtropical regions. Here, we used a proxy-based approach to explore the community dynamics of testate amoebae (Arcellinida and Euglyphida) in two subtropical deep reservoirs (Tingxi and Shidou) in Xiamen, southeastern China, over a three-year period. Specifically, we employed drought and typhoon events recorded by weather station as proxies for ecological disturbance and chlorophyll-a estimated through fluorometry as a proxy for testate amoeba food. We addressed three questions: (1) Does typhoon-induced ecological disturbance affect the distribution patterns of testate amoebae in subtropical reservoirs? (2) Do typhoon- and drought-induced ecological disturbances affect the testate amoeba community across different water layers of subtropical reservoirs similarly? (3) Do stochastic or deterministic processes shaping the testate amoeba community over time exhibit similar patterns in different water layers of subtropical reservoirs? The typhoon-induced ecological disturbance resulted in pronounced shifts in the distribution patterns of testate amoebae, characterized by lower shell influx in surface waters (11-12 ind. mL(-1) d(-1)) and higher shell influx in middle and bottom waters (12-22 ind. mL(-1) d(-1)). The impact of typhoon-and drought-induced ecological disturbance was more pronounced in surface waters, and its pure explanation accounted for 29.5-35.5 % community variation in a variation partitioning analysis. The effect of stochastic processes revealed by the neutral model increased with water depths, accounting for 63.3-76.5 % of the community variation in the surface, 77.4-82.6 % in the middle, and 82.8-88.1 % in the bottom water. The effect of deterministic processes shown by the null model decreased with water depth and remained relatively low across all water layers. These results suggest contrasting patterns of assembly mechanisms underlying the testate amoeba community responses to ecological disturbance, with the balance perhaps shaped by water depth and the average water residence time in a reservoir.

引用

页数：14